R5108G34A-TR [RICOH]
Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO8, 2.90 X 4 MM, 0.65 MM PITCH, SSOP-8;
| 型号： | R5108G34A-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO8, 2.90 X 4 MM, 0.65 MM PITCH, SSOP-8 光电二极管 |
| 文件： | 总13页 (文件大小：358K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Microprocessor Supervisory Circuit
NO. EA-171-080602
R5108G SERIES
OUTLINE
The R5108G Series are CMOS-based µ con supervisory circuit, or high accuracy and ultra low supply current
voltage detector with built-in delay and watchdog timer. When the SENSE voltage is down across the threshold,
or the watchdog timer does not detect the system clock from the µ con, the reset output is generated. The
voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the
tolerance is ±1.0%. The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is
adjustable with an external capacitor. When the sense voltage becomes the released voltage, the reset state will
be maintained during the delay time. The time out period of the watchdog timer can be also set with an external
capacitor. The output type of the reset is selectable, Nch open-drain, or CMOS. There is a function to stop
supervising clock by the watchdog timer (INH function). A necessary voltage source can be supervised with
SENSE pin. The package is small SSOP-8G.
FEATURES
• Built-in a watchdog timer's time out period accuracy
±30%
• Timeout period for watchdog and generating a reset signal can be set by an external capacitor
• Detector Threshold Voltage ····························· 0.1V stepwise setting in the range from 1.5V to 5.5V
• Supply current·················································· Typ. 11µA
• Operating Voltage ············································ 1.5V to 6.0V
• High Accuracy Output Voltage of Detector Threshold ············································· ±±.0%
• Power-on Reset Delay Time accuracy············· ±20%
• Power-on reset delay time of the voltage detector can be set with an external capacitor.
• Small Package················································· SSOP-8G (0.65mm pitch)
APPLICATION
• Supervisory circuit for equipment with using microprocessors.
1
R5108G
BLOCK DIAGRAMS
SENSE
VDD
CD
+
-
-
+
GND
SCK
CLOCK
WATCHDOG
TIMER
DETECTOR
TW
RESETB
INH
R5108GxxxA
SENSE
VDD
CD
+
-
-
+
GND
SCK
CLOCK
WATCHDOG
TIMER
DETECTOR
TW
RESETB
INH
R5108GxxxC
2
R5108G
SELECTION GUIDE
The selection can be made with designating the part number as shown below:
R5108Gxx1x-TR ←part Number
↑ ↑ ↑ ↑
a
b c d
Code
Descriptions
Designation of Package Type;
a
b
G: SSOP8G (2.9mmx4.0mm)
Designation of Detector Threshold Voltage (-VDET)
0.1V stepwise setting is possible in the range from 1.5V to 5.5V
Designation of the output type of RESETB
c
A: Nch Open-drain
C: CMOS Output
d
Designation of Taping Type
PIN CONFIGURATION
VDD
1
8
7
6
RESETB
R5108GxxxA
R5108GxxxC
2
3
SENSE
CD
TW
INH
SCK
GND
SSOP8G (0.65mm pitch)
PIN DESCRIPTION
Pin No
Symbol
Pin Description
Output Pin for Reset signal of Watchdog timer and Voltage
Detector. (Output “L” at detecting Detector Threshold and
Watchdog Timer Reset.)
1
RESETB
2
3
4
5
6
SENSE
CD
Voltage Detector Voltage Sense Pin
External Capacitor Pin for Setting Delay Time of Voltage Detector
Ground Pin
GND
SCK
INH
Clock Input Pin from Microprocessor
Inhibit Pin ("L": Inhibit the watchdog timer)
External Capacitor Pin for Setting Reset and Watchdog Timeout
7
8
TW
VDD
Periods
Power supply Pin
3
R5108G
ABSOLUTE MAXIMUM RATINGS
Topt=25°C, VSS=0V
Symbol
VIN
Item
Rating
-0.3∼7.0
-0.3∼VIN+0.3
-0.3∼VIN+0.3
-0.3∼7.0
-0.3∼7.0
-0.3∼7.0
-0.3∼7.0
20
Unit
V
V
Supply Voltage
Output Voltage
VCD
Voltage of CD Pin
VTW
Voltage of TW Pin
V
VRESETB
VSCK
VINH
Voltage of RESETB Pin
Voltage of SCK Pin
Voltage of INH Pin
V
V
Input Voltage
V
VSENSE
IRESETB
PD
Voltage of SENSE Pin
Current of RESETB Pin
V
Output Current
mA
mW
°C
°C
Power Dissipation
300
Topt
Operating Temperature Range
Storage Temperature Range
-40∼+105
-55∼+125
Tstg
ELECTRICAL CHARACTERISTICS
R5108GxxxA/C
Unless otherwise specified, VIN=6.0V, CTW=0.1uF, CD=0.1uF, Rpull-up=100kΩ,Topt=25°C
The number of Bold font applied to the temperature range from -40°C to 105°C
Symbol
Item
Conditions
Min.
1.5
Typ.
Max.
6.0
Unit
VIN
Operating Voltage
V
VIN=(-VDET)+0.5V
Clock Pulse Input
Iss
Supply Current
11
15
µA
Voltage Detector
x0.990
x1.010
-VDET
Detector Threshold
SENSE pin Threshold
V
x0.972
x1.015
ppm/
°C
∆-VDET/
∆Topt
Detector Threshold
Temperature Coefficient
Detector Threshold
Hysteresis
-40°C≤Topt≤105°C
±100
(-VDET) (-VDET) (-VDET)x
VHYS
tpLH
VINL
V
ms
V
x0.03
340
x0.05
370
0.07
467
Output Delay Time
CD=0.1µF
RESETB≤0.1V,
pull-up=100kΩ
Minimum Operating Voltage
0.6
0.9
Output Current (RESETB
Output pin)
IDOUTN
IDOUTP
Nch, VDD=1.2V, VDS=0.1V
0.38
0.65
0.80
0.90
mA
mA
Output Current (RESETB
Output pin)
Nch, VDD=6.0V,
VDS=0.5V(R5108GxxxC)
Watchdog Timer
TWD
TWR
Watchdog Timeout period
Reset Hold Time of WDT
SCK Input "H"
CTW=0.1uF
230
29
310
34
450
48
6.0
ms
ms
V
CTW=0.1uF
VSCKH
VSCKL
VINHH
VINx0.8
0.0
SCK Input "L"
VINx0.2
6.0
V
INH Input "H"
1.0
V
4
R5108G
Symbol
VINHL
Item
INH Input "L"
Conditions
Min.
0.00
60
Typ.
Max.
0.35
164
Unit
V
RINH
INH pull-up Resistance
SCK Input Pulse Width
110
kΩ
VSCKL=VINx0.2,
TSCKW
500
ns
VSCKH=VINx0.8
*Bold Type is guaranteed by design.
TYPICAL APPLICATIONS
Power supply
DD
V
R
RESET
VDD
RESETB
µ
P
SENSE
R5108GxxxA
SCK
TW
I/O
INH
Series
D
C
GND
CD
TW
C
SW
C
DD
V
Power supply
DD
V
RESETB
RESET
SENSE
µ
I/O
P
R5108GxxxC
Series
INH
SCK
TW
D
C
GND
SW
CD
C
TW
C
TEST CIRCUIT
R(R5108GxxxA)
RESETB
SCK
A
VDD
R5108GxxxA/C
SENSE
INH
Clock Input
Series
TW
D
TW
C
C
GND
CD
C
Supply Current Test Circuit
5
R5108G
TIMING DIAGRAM (R5108GxxxA/R5108GxxxC)
(Nch open-drain, RESETB pin is pulled up to VDD.)
VDD
ＩNＨ
+VDET
-VDET
CD
tpLH
tpLH
TWDI
TWD
VrefH
TW
TWR
tpHL
SCK
tpLH
RESETB
(1) (2)
(4)
(3) (5)
(6)
6
R5108G
OPERATION
M When the SENSE pin voltage becomes more than the released voltage (+VDET), after the released delay
time (or the power on reset time tpLH), the output of RESETB becomes “H” level.
N When the SCK pulse is input, the watchdog timer is cleared, and TW pin mode changes from discharge
mode to charge mode. When the TW pin voltage becomes higher than VREFH, the mode will change into
discharge, and next watchdog time count starts.
O Unless the SCK pulse is input, WDT will not be cleared, and during the charging period of TW pin,
RESETB="L".
P When the SENSE pin becomes lower than the detector threshold voltage, RESETB outputs "L".
Q If "L" signal is input to the INH pin, the RESETB outputs "H", regardless the SCK clock state.
R When the signal to the INH pin is set from "L" to "H", the watchdog starts supervising the system clock.
∗ Watchdog Timeout period/Reset hold time
The watchdog timeout period and reset hold time can be set with an external capacitor to TW pin.
The next equations describe the relation between the watchdog timeout period and the external capacitor
value, or the reset hold time and the external capacitor value.
tWD(s) = 3.1*106× C (F)
tWR(s)=tWD/9
The watchdog timer (WDT) timeout period is determined with the discharge time of the external capacitor.
During the watchdog timeout period, if the clock pulse from the system is detected, WDT is cleared and the
capacitor is charged. When the charge of the capacitor completes, another watchdog timeout period starts
again. During the watchdog timeout period, if the clock pulse from the system is not detected, during the
next reset hold time RESETB pin outputs "L".
After starting the watchdog timeout period, (just after from the discharge of the external capacitor) even if the clock pulse
is input during the time period "TWDI", the clock pulse is ignored.
TWDI[s]=TWD/10
Released Delay Time (Power-on Reset delay time)
The released delay time can be set with an external capacitor connected to the CD pin. The next equation describes the
relation between the capacitance value and the released delay time (tpLH).
tpLH(s)=3.7×106× C(F)
Note that the temperature dependence graph in the typical characteristics does not contain the temperature characteristics
of the external capacitor.
ꢀ
Minimum Operating Voltage (VINL)
We specified the minimum operating voltage as the minimum input voltage in which the condition of RESETB pin being
0.1V or lower than 0.1V. (Herein, pull-up resistance is set as 100kΩ in the case of the Nch open-drain output type.
Inhibit (INH) Function
If INH pin is set at "L", the watchdog timer stops monitoring the clock, and the RESETB output will be dominant by the
voltage detector's operation. Therefore, if the SENSE pin voltage is set at more than the detector threshold level, RESETB
outputs "H" regardless the clock pulse. INH pin is pulled up with a resistor (TYP. 110kΩ) internally.
7
R5108G
SENSE Function
Built-in Voltage detector monitors the input voltage for SENSE pin. To obtain the normal detector threshold, Vin≥1.5V
must be secured.
RESETB Output
RESETB pin's output type is selectable either the Nch open-drain output or CMOS output. If the Nch
open-drain type output is selected, the RESETB pin is pulled up with an external resistor to an appropriate
voltage source.
Clock Pulse Input
Built-in watchdog timer is cleared with the SCK clock pulse within the watchdog timeout period.
Power on Reset Operation against the input gtlitch
)
(tpLH1 < tpLH
+V
DET
-V DET
VDD
0V
Perfect Discharge
TCD
+V
TCD
-V
0V
C
D
Imperfect Discharge
RESETB
0V
tpLH
tpLH1
APPLICATION NOTES
If a resistor is connected to the VDD pin, the operation might be unstable with the supply current of IC itself.
VDD
VIN
VDD
VIN
VDD
R1
R1
R1
IN
R2
R2
R5108
CMOS
Output
R5108
R5108
RESETB
RESETB
RESETB
Connection examples affected by the conduction current
8
R5108G
TYPICAL CHARACTERISTICS
1) Supply Current vs. Input Voltage
R510xN151A/C, R510xG151A/C
R510xN301A/C, R510xG301A/A
20
18
16
14
12
20
18
16
14
12
10
8
105℃
10
8
105℃
25℃
-50℃
25℃
6
6
-50℃
4
4
2
2
0
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
SUPPLY VOLTAGE [V]
SUPPLY VOLTAGE [V]
2) Detector Threshold vs. Temperature
R5ꢀ0xNꢀ5ꢀA/C, R5ꢀ0xGꢀ5ꢀA/C
R5ꢀ0xN27ꢀA/C, R5ꢀ0xG27ꢀA/C
ꢀ.530
ꢀ.520
ꢀ.5ꢀ0
ꢀ.500
ꢀ.490
ꢀ.480
ꢀ.470
2.740
2.730
2.720
2.7ꢀ0
2.700
2.690
2.680
2.670
2.660
-50
-25
0
25
50
75
ꢀ00
ꢀ25
-50 -25
0
25
50
75
ꢀ00 ꢀ25
TEMPERATURE [ꢁ]
TEMPERATURE [ꢁ]
R5ꢀ0xN42ꢀA/C R5ꢀ0xG42ꢀA/C
4.280
4.260
4.240
4.220
4.200
4.ꢀ80
4.ꢀ60
4.ꢀ40
4.ꢀ20
-50 -25
0
25
50
75
ꢀ00 ꢀ25
TEMPERATURE [ꢁ]
9
R5108G
3) Detector Threshold Hysteresis vs. Temperature
R5ꢀ0xNꢀ5ꢀA/C R5ꢀ0xGꢀ5ꢀA/C
R5ꢀ0xN27ꢀA/C R5ꢀ0xG27ꢀA/C
7.0
7.0
6.0
5.0
4.0
3.0
6.0
5.0
4.0
3.0
-50
-25
0
25
50
75
ꢀ00
ꢀ25
-50
-25
0
25
50
75
ꢀ00
ꢀ25
TEMPERATURE [ꢁ]
TEMPERATURE [ꢁ]
R5ꢀ0xN42ꢀA/C R5ꢀ0xG42ꢀA/C
7.000
6.000
5.000
4.000
3.000
-50
-25
0
25
50
75
ꢀ00
ꢀ25
TEMPERATURE [ꢁ]
4) Detector Threshold vs. Input Voltage
R5ꢀ08Gꢀ5ꢀA/C
ꢀ.53
Topt=25ꢁ
ꢀ.52
ꢀ.5ꢀ
ꢀ.5
ꢀ.49
ꢀ.48
ꢀ.47
ꢀ.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE VDD [V]
10
R5108G
5) Nch Driver Output Current vs. VDS Topt=25°C
R5ꢀ0xN, R5ꢀ0xG
20
VDD=6.0V
VDD=5.0V
VDD=4.0V
ꢀ8
ꢀ6
ꢀ4
ꢀ2
ꢀ0
8
VDD=3.0V
VDD=2.0V
VDD=1.5V
6
4
VDD=1.0V
2
0
0.0
0.2
0.4
0.6
0.8
ꢀ.0
ꢀ.2
ꢀ.4
VDS [V]
6) Nch Driver Output Current vs. VDD
R5ꢀ0xN, R5ꢀ0xG
R5ꢀ0xN, R5ꢀ0xG
Topt=-40ꢁ
20
20
ꢀ8
ꢀ6
ꢀ4
ꢀ2
ꢀ0
8
ꢀ8
ꢀ6
ꢀ4
Vds=0.5V
25ꢁ
Vds=0.3V
Topt=-40ꢁ
ꢀ2
ꢀ0
8
25ꢁ
105ꢁ
6
ꢀ05ꢁ
6
4
4
2
2
0
0
ꢀ
2
3
4
5
6
0
0
ꢀ
2
3
4
5
6
SUPPLY VOLTAGE VDD [V]
SUPPLY VOLTAGE VDD [V]
7) Pch Driver Output Current vs. VDD
R5ꢀ0xN, R5ꢀ0xG
2.0
R5ꢀ0xN, R5ꢀ0xG
2.0
ꢀ.8
ꢀ.6
ꢀ.4
ꢀ.2
ꢀ.0
ꢀ.8
ꢀ.6
ꢀ.4
ꢀ.2
ꢀ.0
0.8
0.6
0.4
0.2
0.0
VDS=0.3V
VDS=0.5V
-40ꢁ
25ꢁ
-40ꢁ
0.8
0.6
0.4
0.2
0.0
25ꢁ
ꢀ05ꢁ
ꢀ05ꢁ
0
ꢀ
2
3
4
5
6
0
ꢀ
2
3
4
5
6
SUPPLY VOLTAGE [V]
SUPPLY VOLTAGE [V]
11
R5108G
R5ꢀ0xN, R5ꢀ0xG
VDS=ꢀ.0V
2.0
ꢀ.8
ꢀ.6
ꢀ.4
ꢀ.2
ꢀ.0
0.8
0.6
0.4
0.2
-40ꢁ
25ꢁ
ꢀ05ꢁ
0.0
0
ꢀ
2
3
4
SUPPLY VOLTAGE [V]
5
6
8) Released Delay Time vs. Input Voltage
9) Released Delay Time vs. Temperature
R5ꢀ0xN, R5ꢀ0xG
R5ꢀ0xN, R5ꢀ0xG
500
500
480
480
VDD=6V
Topt=25ꢁ
460
460
440
420
400
380
360
340
320
300
440
420
400
380
360
340
320
300
-50 -25
0
25 50 75 ꢀ00 ꢀ25 ꢀ50
0
ꢀ
2
3
4
5
6
7
TEMPERATURE [ꢁ]
SUPPLY VOLTAGE [V]
10) Detector Output Delay Time vs. Temperature
11) WDT Reset Timer vs. Temperature
R5ꢀ0xN, R5ꢀ0xG
R5ꢀ0xN, R5ꢀ0xG
ꢀ00
50
90
48
46
44
42
40
38
36
34
32
30
ꢀus
80
70
(-VDET)+ꢀ
60
INPUT
(-VDET)-ꢀ
50
40
30
20
ꢀ0
0
-50
-25
0
25
50
75
ꢀ00
ꢀ25
TEMPERATURE [ꢁ]
-50
-25
0
25
50
75
ꢀ00
ꢀ25
TEMPERATURE [ꢁ]
12
R5108G
12) WDT Timeout Period vs. Temperature
13) WDT Reset Timer vs. Input Voltage
R5ꢀ0xN, R5ꢀ0xG
R510xN, R510xG
400
50
380
360
340
320
300
280
260
240
220
200
48
46
44
42
40
38
36
34
32
30
-50 -25
0
25
50
75
100 125
ꢀ
2
3
4
5
6
TEMPERATURE [ꢁ]
SUPPLY VOLTAGE [V]
14) WDT Timeout Period vs. Input Voltage
R510xN, R510xG
400
380
360
340
320
300
280
260
240
220
200
1
2
3
4
5
6
SUPPLY VOLTAGE [V]
13
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